package cn.tedu.sp06.filter;


import com.netflix.zuul.ZuulFilter;
import com.netflix.zuul.context.RequestContext;
import com.netflix.zuul.exception.ZuulException;
import org.apache.commons.lang3.StringUtils;
import org.springframework.cloud.netflix.zuul.filters.support.FilterConstants;
import org.springframework.stereotype.Component;

import javax.servlet.http.HttpServletRequest;
import java.nio.charset.Charset;

@Component
public class AccessFilter extends ZuulFilter {
    //设置过滤器的类型:pre、routing、post、error
    @Override
    public String filterType() {
//        return "pre";两种写法都可以
        return FilterConstants.PRE_TYPE;
    }

    //位置序号 前置过滤器默认有5个
    @Override
    public int filterOrder() {
        return 6;
    }

    //判断针对当前请求,是否执行过滤代码
    @Override
    public boolean shouldFilter() {
        /*
        调用商品判断权限,
        调用用户和订单,不检查权限
         */

        //获得调用的服务id
        RequestContext ctx=RequestContext.getCurrentContext();
        String serviceId = (String) ctx.get(FilterConstants.SERVICE_ID_KEY);

        return "item-service".equals(serviceId);
    }

    //过滤代码
    @Override
    public Object run() throws ZuulException {
        // http://localhost:3001/item-service/t34t34?token=t34t34

        //获得requst对象
        RequestContext ctx = RequestContext.getCurrentContext();
        HttpServletRequest request = ctx.getRequest();
        //接收token参数
        String token=request.getParameter("token");
        //如果没有token,阻止继续访问,直接返回响应
        //if(token==null || token.length()==0 || token.trim().length()==0)
        if(StringUtils.isBlank(token)){
            //阻止继续访问
            ctx.setSendZuulResponse(false);
            //直接返回响应
            ctx.addZuulResponseHeader("Content-Type","text/html; Charset=UTF8");
            ctx.setResponseBody("Not Login! 未登录!");
        }
        //这个返回值不起任何作用,返回任何数据都可以
        return null;
    }
}
